// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_SCOPED_NATIVE_LIBRARY_H_
#define BASE_SCOPED_NATIVE_LIBRARY_H_

#include "base/base_export.h"
#include "base/macros.h"
#include "base/native_library.h"

namespace base {

class FilePath;

// A class which encapsulates a base::NativeLibrary object available only in a
// scope.
// This class automatically unloads the loaded library in its destructor.
class BASE_EXPORT ScopedNativeLibrary {
public:
    // Initializes with a NULL library.
    ScopedNativeLibrary();

    // Takes ownership of the given library handle.
    explicit ScopedNativeLibrary(NativeLibrary library);

    // Opens the given library and manages its lifetime.
    explicit ScopedNativeLibrary(const FilePath& library_path);

    ~ScopedNativeLibrary();

    // Returns true if there's a valid library loaded.
    bool is_valid() const { return !!library_; }

    NativeLibrary get() const { return library_; }

    void* GetFunctionPointer(const char* function_name) const;

    // Takes ownership of the given library handle. Any existing handle will
    // be freed.
    void Reset(NativeLibrary library);

    // Returns the native library handle and removes it from this object. The
    // caller must manage the lifetime of the handle.
    NativeLibrary Release();

private:
    NativeLibrary library_;

    DISALLOW_COPY_AND_ASSIGN(ScopedNativeLibrary);
};

} // namespace base

#endif // BASE_SCOPED_NATIVE_LIBRARY_H_
